fcitx support was just added because of a bug (boo#1025413) that
could be fixed by building with fcitx support but upstream SDL2
developers fixed it in 2.0.5 when building without fcitx support
too. Also fcitx support has always been disabled in SLE/Leap and
in Factory it's built against fcitx 4.2.9.9, not the newer fcitx5
so let's disable it in order to reduce dependencies.
